<!DOCTYPE html>

<html lang='en'>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/react.development16.4.0.js"></script>
    <script src="./lib/react-dom.development16.4.0.js"></script>
    <script src="./lib/babel.min.js"></script>
</head>

<body>
    <div id="app">
    </div>
    <script type="text/babel">
       class Hello extends React.Component {
 
        constructor(props) {
            super(props);
            this.state = {opacity: 1.0};
        }

        componentDidMount() {
           setInterval(()=>{
                var opacity = this.state.opacity;
                opacity -= .05;
                if (opacity < 0.1) {
                  opacity = 1.0;
                }
                this.setState({opacity: opacity});
            },100);
        }
        

        render () {
            return (
            <div style={{opacity: this.state.opacity}}>
            Hello {this.props.name}
            </div>
           );
           }
        }

        ReactDOM.render(
        <Hello name="world"/>,
        document.getElementById('app')
        );
    </script>
</body>

</html>